1 // go:build go1.18 && !go1.20 2 //go:build go1.18 && !go1.20 3 // +build go1.18,!go1.20 4 5 /* 6 * Copyright 2021 ByteDance Inc. 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package loader 22 23 import ( 24 `github.com/bytedance/sonic/internal/rt` 25 ) 26 27 const ( 28 _Magic uint32 = 0xfffffff0 29 ) 30 31 type moduledata struct { 32 pcHeader *pcHeader 33 funcnametab []byte 34 cutab []uint32 35 filetab []byte 36 pctab []byte 37 pclntable []byte 38 ftab []funcTab 39 findfunctab uintptr 40 minpc, maxpc uintptr // first func address, last func address + last func size 41 42 text, etext uintptr // start/end of text, (etext-text) must be greater than MIN_FUNC 43 noptrdata, enoptrdata uintptr 44 data, edata uintptr 45 bss, ebss uintptr 46 noptrbss, enoptrbss uintptr 47 end, gcdata, gcbss uintptr 48 types, etypes uintptr 49 rodata uintptr 50 gofunc uintptr // go.func.* is actual funcinfo object in image 51 52 textsectmap []textSection // see runtime/symtab.go: textAddr() 53 typelinks []int32 // offsets from types 54 itablinks []*rt.GoItab 55 56 ptab []ptabEntry 57 58 pluginpath string 59 pkghashes []modulehash 60 61 modulename string 62 modulehashes []modulehash 63 64 hasmain uint8 // 1 if module contains the main function, 0 otherwise 65 66 gcdatamask, gcbssmask bitVector 67 68 typemap map[int32]*rt.GoType // offset to *_rtype in previous module 69 70 bad bool // module failed to load and should be ignored 71 72 next *moduledata 73 } 74 75 type _func struct { 76 entryOff uint32 // start pc, as offset from moduledata.text/pcHeader.textStart 77 nameOff int32 // function name, as index into moduledata.funcnametab. 78 79 args int32 // in/out args size 80 deferreturn uint32 // offset of start of a deferreturn call instruction from entry, if any. 81 82 pcsp uint32 83 pcfile uint32 84 pcln uint32 85 npcdata uint32 86 cuOffset uint32 // runtime.cutab offset of this function's CU 87 funcID uint8 // set for certain special runtime functions 88 flag uint8 89 _ [1]byte // pad 90 nfuncdata uint8 // 91 92 // The end of the struct is followed immediately by two variable-length 93 // arrays that reference the pcdata and funcdata locations for this 94 // function. 95 96 // pcdata contains the offset into moduledata.pctab for the start of 97 // that index's table. e.g., 98 // &moduledata.pctab[_func.pcdata[_PCDATA_UnsafePoint]] is the start of 99 // the unsafe point table. 100 // 101 // An offset of 0 indicates that there is no table. 102 // 103 // pcdata [npcdata]uint32 104 105 // funcdata contains the offset past moduledata.gofunc which contains a 106 // pointer to that index's funcdata. e.g., 107 // *(moduledata.gofunc + _func.funcdata[_FUNCDATA_ArgsPointerMaps]) is 108 // the argument pointer map. 109 // 110 // An offset of ^uint32(0) indicates that there is no entry. 111 // 112 // funcdata [nfuncdata]uint32 113 } 114